祁连山区的含煤地层有中、上石炭统、上三叠统和下、中侏罗统等(图1),其中最具经济价值的煤系地层,是上石炭统和中侏罗统。从大地构造发展阶段看,祁连山在泥盆纪以前,属前地槽和地槽阶段;加里东运动后进入地台阶段;印支运动以后开始转入地洼阶 The coal-bearing strata in the Qilian Mountains include the Middle and Upper Carboniferous, the Upper Triassic, the Lower and Middle Jurassic, etc. (Figure 1). The most economically valuable coal strata are Upper Carboniferous and Middle Jurassic. From the stage of geotectonic development, before the Devonian, the Qilian Mountains belonged to the former geosyncline and geosyncline. After the Caledonian movement, they entered the platform stage. After the Indosinian movement began to migrate to the dimples